The manufacturer or his authorised EU representative is responsible for the CE marking. In all other cases the importer, or whoever may place the product on the market, is responsible. What harmonized standards the manufacturer or his authorised representative have to apply for, is published in the Official Journal of the European Union.

TÜV Rheinland tests all product requirements according to the Low Voltage Directive including many details as insulation, creepage and clearance distance and integrated components etc. 

The EC declaration of conformity refers to the tested sample as stated in the certificate. It certifies that this sample complies with the safety objectives according to the latest version of Low Voltage Directive Annex I. The certificate does not refer to serial production of the product and it does not authorize to use a TÜV Rheinland test mark. The owner is entitled to use this certificate as provided for in his EC declaration of conformity according to Annex II of this directive.